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all: use case-sensitive JSON unmarshaling (#807)

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As reported in
https://github.com/modelcontextprotocol/go-sdk/issues/805, case
insensitive unmarshaling can pose security issues. This change adjusts
all non-test and non-example unmarshaling to use a case sensitive mode.

This introduces a new external dependency
`github.com/segmentio/encoding`.
This commit is contained in:
Maciej Kisiel 2026-02-18 16:38:36 +01:00 • committed by GitHub
commit 7b8d81c264
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1 changed files with 134 additions and 25 deletions
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3
mcp/shared.go
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@ -23,6 +23,7 @@ import (
"time"
"github.com/modelcontextprotocol/go-sdk/auth"
internaljson "github.com/modelcontextprotocol/go-sdk/internal/json"
"github.com/modelcontextprotocol/go-sdk/internal/jsonrpc2"
"github.com/modelcontextprotocol/go-sdk/jsonrpc"
)
@ -283,7 +284,7 @@ func newMethodInfo[P paramsPtr[T], R Result, T any](flags methodFlags) methodInf
unmarshalParams: func(m json.RawMessage) (Params, error) {
var p P
if m != nil {
if err := json.Unmarshal(m, &p); err != nil {
if err := internaljson.Unmarshal(m, &p); err != nil {
return nil, fmt.Errorf("unmarshaling %q into a %T: %w", m, p, err)
}
}